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1. Goldstone Bosons

   Linked via "Nambu-Goldstone realization"

   Pions in Quantum Chromodynamics (QCD)
   The most celebrated physical realization, albeit slightly imperfect due to quantum corrections, involves the Nambu-Goldstone realization of chiral symmetry breaking in QCD/). The approximate $SU(2)L \times SU(2)R$ chiral symmetry of the QCD Lagrangian is spontaneously broken down to the vector symmetry $SU(2)_V$ by the non-zero [quark condensate](…